html,
body,
#app {
    margin: 0;
    padding: 0px;
    height: 100%;
}

.header {
    height: 50px;
    background-color: #545c64;
    line-height: 50px;
    text-align: center;
    font-size: 24px;
    color: #fff;
}

.footer {
    height: 40px;
    line-height: 40px;
    background-color: #888;
    position: absolute;
    bottom: 0;
    width: 100%;
    text-align: center;
    color: #fff;
}

.main {
    display: flex;
    position: absolute;
    top: 50px;
    bottom: 40px;
    width: 100%;
}

.content {
    flex: 1;
    text-align: center;
    height: 100%;
}

.left {
    flex: 0 0 20%;
    background-color: #545c64;
}

.left a {
    color: white;
    text-decoration: none;
}

.right {
    margin: 5px;
}

.btns {
    width: 100%;
    height: 35px;
    line-height: 35px;
    background-color: #f5f5f5;
    text-align: left;
    padding-left: 10px;
    box-sizing: border-box;
}

button {
    height: 30px;
    background-color: #ecf5ff;
    border: 1px solid lightskyblue;
    font-size: 12px;
    padding: 0 20px;
}

.main-content {
    margin-top: 10px;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

ul li {
    height: 45px;
    line-height: 45px;
    background-color: #a0a0a0;
    color: #fff;
    cursor: pointer;
    border-bottom: 1px solid #fff;
}

table {
    width: 100%;
    border-collapse: collapse;
}

td,
th {
    border: 1px solid #eee;
    line-height: 35px;
    font-size: 12px;
}

th {
    background-color: #ddd;
}